It wasn't so much violence as brilliantly-written horror... true, some poor guy got his head smashed in because he tried to nick a can of Coke, but that wasn't the worst thing.
As for the Black Hole, I have no idea what that is, so I couldn't say.
The plot for The Hole is that four university students get locked in some underground bunker, and only one comes out alive after a whole series of events which were, put simply, her fault. IMDB it for more/better info.